Sound-emitting device



May 14,-1929. A. P. YOUNG ET AL SOUND EMITTING DEVICE Filed April 18, 1924 Inventors w um 0 8 J m g w 0 t F mwxw r e H .n WL O Patented May 14, 19.29.

UNITED STATES PATENT OFFICE.

ARTHUR PRIMROSE YOUNG, OF KENILWORTH, AND JOHN HENRY BUTCHER, OF

RUGBY, ENGLAND, 'ASSIGNORS TO GEISI'IElRAIlI on NEW YORK. I

ELECTRIC COMPANY, A CORPORATION SOUND-EMITTIN G DEVICE.

Application filed April 18, 1924, Serial N01. 707,502, and in Great Britain April 28, 1923.

Our present invention relates to sound transmitting or emitting instruments and particularly to an improved arrangementof the sound passages or horns of such an 1nstrument whereby a compact designof good appearance is obtained. It is especially applicable to telephone receivers or loud speakers for wireless'telephony.

According to the present invention, a compact design is obtained by arranging the sound passage or passages between the sound emitting instrument and a plain or cor-rugated dome-shaped surface, with or wlthout flared or turned-back edges.

The outer surfaceof the sound passage may itself form a dome-shaped cover, and one or more helical or radial webs, formed preferably of wood, papier mach, or sheet metal, may be arranged between the 1nner and outer surfaces. Qbviously the sound passage may consist of a single annular sound horn arranged partly around the instrument, or, alternately, a number of suitably curved sound horns, projecting star fashion from the instrument, may be used.

Various methods of carrying out the present invention are illustrated by way 0 example in the accompanying drawings: Fig. 1 represents a loud speaking telephone having an annular sound passage provided with a helical web, the outercover being shown in section; Fig. 2 is an arrangement for intensifying the sound from an ordinary receiver; Fig. 3 is a modification showing a half plan view of a loud speaking telephone with an annular sound horn and Fig. 3 a part sectional elevation thereof; Fig. 4 is a half plan view of another modification and Fig. a sectional elevation thereof on the line i of Fig. 1. Like reference numerals are used throughout to denote similar parts,

eferring now to Fig. 1, a loud speaking instrument 11 is provided at its upper end with a projecting opening 12 through which sound generated Within the instrument passes. The sound passages are constituted by a dome-shaped cover 13 and a bullet shaped member 14 provided with a reentrant portion 15 adapted to fit over the opening 12. The. member 14. is arranged to envelope the instrument 11, as shown, and is supported from the cover 13 by means of a spider 16. Between the cover 13 and the member 14 may be arranged one or more helical webs similar to 17 and formed of papier mach, wood, or sheet metal. The path of the sound emitted by the instrument 12 is represented by the arrows, and the sound finally escapes through the openings 20.

Referring now to Fig. 2, a dome-shaped plate 13 is supported upon brackets 18 which also carry a telephone receiver 19 of the ordinary watch' case type. Arranged centrally of these supporting brackets is a horn 21 through which the sound produced within the telephone receiver passes, being reflected back from the interior of the cover plate 13.

The constructions shown in Figs. 3 and 4 are substantially similar to that of Fig.1 but are especially suitable for mounting on a wall or on a vertical partition of a Wireless cabinet. Instead of the helical web 17, vertical Webs 22 are provided between the surfaces 13 and 23 of the sound passage and these webs may serve to support theinner member and the receiver. In Fig. 3 the instrument 11 is substantially enclosed by the surface 23 and a mirror 24 supported by the edge'thereof. The dome-shaped surface 13 in Figs. 4 and 4 is provided with a curled round edge 25 and the other surface 23 is correspondingly shaped so that the sound passages are substantially clear of the instrument. Any of the constructions above described maybe supported with the domeshaped casing or cover plate 13 above or below the instrument 11; or the apparatus may be hung from a nail or the like, or supported by other means, so that the axis of the dome-shaped surface is horizontal.

A loud speaking telephone constructed upon these principles may be used as a table instrument; or on account of its compact de sign, it is very suitable for mounting in acompartment of a cabinet type of wireless receiving set.

Itwill be observed that by means of the constructions illustrated it is possible to form a sound passage of any configuration desired and of a length greater than the height of the dome-shaped member. In this way a sound assage of the desired length may be obtained and the instrument may be made more compact than when a horn of the usual type is employed.

ing instrument located within said member and means surrounding said instrument and forming the inner wall of a sound passage, the outer Wall ofwhich is formed by the dome-shaped member.

2. A sound emitting instrument comprising a dome-shaped member, a sound producing instrument located within said member and means surrounding said instrument and forming the inner wall of an annular sound passage, the outer wall of which is formed by the domeshaped member, said passage being subdivided into a plurality of separate passages by a plurality of radial ribs.

3, A sound emitting instrument comprising a dome-shaped member, a'sound producing instrument located within said member and means surrounding saidinstrument and forming the inner Wall of an annular sound passage, the outerzwall of which is formed by the dome-shaped member, said passage being subdivided into a plurality of separate passages by a plurality of radial ribs, said means being supported on said radial ribs.

In Witness whereof, we have hereunto set our hands this ithirty first day of March, 1924.

ARTHUR PRIMROSE YOUNG. JOHN HENRY BUTCHER. 

